OPTICAL HETERODYNE RECEIVER

In a manner analogous to electrical heterodyne reception, it is possible to construct an optical heterodyne receiver in which coherent received light is heterodyned with the light generated in a local laser and fed to a downstream photoelectric transducer. To date, it has been assumed with regard to...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	BIRTH, WINFRIED
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TRANSMISSION
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Beschreibung
Zusammenfassung:	In a manner analogous to electrical heterodyne reception, it is possible to construct an optical heterodyne receiver in which coherent received light is heterodyned with the light generated in a local laser and fed to a downstream photoelectric transducer. To date, it has been assumed with regard to the heterodyning that the polarisation of the heterodyned light and of the received light are at least approximately in agreement, so that there is a need for automatic control of polarisation. According to the invention, circularly polarised light is heterodyned, so that it is possible to eliminate polarisation controls.